I have a 318is and is wondering if anyone knows do they need to have a catilac convert and that resenator or can they be cut off I am not worried about smog laws cause here in wisconsin they don't check but I was wondering does it need those for back presure or will it actualy help it breath alot better?

Originally posted by crazy91318@May 16 2005, 10:27 PMI have a 318is and is wondering if anyone knows do they need to have a catilac convert and that resenator or can they be cut off I am not worried about smog laws cause here in wisconsin they don't check but I was wondering does it need those for back presure or will it actualy help it breath alot better?

[snapback]345061[/snapback]

Hack that sucker!!! I never did on my BMW (hopefully soon..) but I used to build VW GTI's and that was always one of this first things to go... You will see more high-end power... Just be sure to get everything lined up properly (are you going to hollow them and put back on, or are you going to fabricate something)

I just planed to just go down to a buddies show and have him put some new exhaust from the header back to a muffler and thats it cause I know it realy won't cost me a whole lot but that was my big question about back presure cause I have heard some things about that and wasn't sure I still kind of new to this whole 4cyl thing lol.

Originally posted by crazy91318@May 16 2005, 11:56 PMI just planed to just go down to a buddies show and have him put some new exhaust from the header back to a muffler and thats it cause I know it realy won't cost me a whole lot but that was my big question about back presure cause I have heard some things about that and wasn't sure I still kind of new to this whole 4cyl thing lol.

[snapback]345093[/snapback]

I think that the back pressure will be fine as long as you run like a 2.25" pipe from header back, dont go too crazy with making the exhaust system too large, may risk loosing torque..

K cool yeah I was just thinking on the same size pipe that is one the car just new and new muffler and no cat

Quote:

Originally posted by jze325i+May 17 2005, 10:11 AM--><div class='quotetop'>QUOTE(jze325i @ May 17 2005, 10:11 AM)</div><div class='quotemain'><!--QuoteBegin-crazy91318@May 16 2005, 11:56 PMI just planed to just go down to a buddies show and have him put some new exhaust from the header back to a muffler and thats it cause I know it realy won't cost me a whole lot but that was my big question about back presure cause I have heard some things about that and wasn't sure I still kind of new to this whole 4cyl thing lol.

[snapback]345093[/snapback]

I think that the back pressure will be fine as long as you run like a 2.25" pipe from header back, dont go too crazy with making the exhaust system too large, may risk loosing torque..